Device for applying powder to printed paper



1956 H. LIPSHJS DEVICE FOR APPLYING POWDER TO PRINTED PAPER Filed Dec. 2 1955 FIG.|

INVENTOR.

HERBERT Ll PSIUS ATTO R N E Y United States Patent DEVICE FOR APPLYING POWDER TO PRINTED PAPER Herbert Lipsius, Brooklyn, N. Y., assignor to Embossegraph Process Co., Inc., New York, N. Y., a corporation of New York Application December 23, 1953, Serial No. 399,980

1 Claim. (Cl. 118-312) My invention relates to a device for applying powder to printed paper and its novelty consists in the combination and arrangement of parts as will be more fully hereinafter pointed out.

There is a real problem in feeding a resinous powder to freshly printed paper to secure an embossed or engraved effect so as to insure uniform continuous feeding and the recovery of the excess powder for reuse.

My device accomplishes this in a manner to secure adequate powder without excess and complete recovery of all unused powder suitable for reuse and does so in a simple positive manner securing a perfect product.

One object is to feed the powder steadily at a given rate to secure a uniform product without any waste or excess accumulation of the powder at any point in the cycle of operation.

Another object is to spread the powder evenly and without excess on the freshly printed portions of the paper fed under said powder feeding device.

Another object of my device is to insure a more perfect suction so that even all excess gold and silver powders will be perfectly removed from the printed sheet to prevent smudging the sheet which is a serious problem with these especially fine ground powders.

Other advantages will appear as the device is described and the possible variations are comprehended Within the claim herein covering said invention.

Referring to the drawings:

Fig. l is a sectional side elevation of my device showing the connecting operative portions;

Fig. 2 is a sectional side elevation of the powder feeding mechanism in emptying position with the upper portion broken away for convenience in illustration; and

Fig. 3 is a perspective view of the rotating powder feeding drum.

In the drawings, 1 is the upper part of a metal casing frame rigidly supported on a metal table (not shown) and 2 is a block rigidly secured to said frame 1 by belts 3 by which guard plates 3a are also rigidly secured thereto and said block 2 also has an opening 4 through its upper portion. A hollow drum 5 is mounted on a shaft 6 in said frame 1 so as to rotate in said block 2 by means of a pulley and belt of usual construction (not shown) secured to one end of said shaft 6 and rotated by means of an electric motor (not shown). Said drum 5 has an opening 7 in the side in complete alignment with opening 4 of block 2.

An open top powder holder 8 has an inclined bottom 9 and an opening 10 at the lower end of said inclined bottom 9 leading to an extension portion 11 having a perforated bottom 12 and said holder 8 is suspended from said frame 1 by means of flexible straps 13 which permit the holder 8 to vibrate with the operation of the complete device. An adjustable door 33 controls the flow of powder from the inclined bottom 9 through opening 10 and said door 33 is regulated by adjustable spring tension thumb screw 34.

A centrifugal separator 14 is rigidly secured to the 2,757,635 Patented Aug. 7, 1956 top of the block 2 by means of screws 15 and has an opening 14a at the bottom which coincides with the opening 4 of block 2. A suction line 16 runs from one side of the separator 14 to a waste bag (not shown) and a suction line 17 and 17a is connected to the upper portion of the separator 14 and terminates at its lower end in a head 18 adjacent to the line of travel of a series of conveyor belts 21, 22 and 23 mounted in said metal table (not shown). Said head 18 also has side rollers 19 and 20 to keep the paper flat as it passes thereunder.

Said series of carrier belts 21, 22 and 23, are mounted in the upper portion of the table (not shown) and 21 and 22 are rubber belts leading from the printing press and under the powder feeding device and 23 is a metal belt as it runs to and through the heat drying section of the table (not shown).

The casing frame 1 has a side opening 24 over which is removably mounted a transparent plastic window 25 by means of a pair of guards 26 pivoted on pins 27 at the bottom and a pair of brackets 28 secured rigidly to the casing frame 1 by screws 29.

The suction line 17 has an adjustable sleeve 17b to permit perfect adjustment of the lower section 17a of 17 to be adjusted so as to insure the exact position of the head 18 relative to the freshly printed paper 30 passing thereunder. The head 18 also has a guide arm 31 to prevent the printed paper 30 from pulling up as it leaves the position under suction head 18.

The combination of the hollow drum 5 with a single opening 7 effects a more perfect seal as it rotates in the block 2 so that the suction line 17 and 17a with the head 18 is at all times at full suction strength thereby insuring the complete removal of all excess powder from the printed paper 30 and especially the very fine gold and silver powders which smudge 30 unless all excess is completely removed.

A feed hopper and feed pipe 32 leads into powder holder 8 so that fresh powder can be originally fed therethrough into holder 8 and added thereto as becomes necessary.

In operating my device, an amount of resin powder is fed through the feed hopper 32 into the container 8 and the motor started to operate the pulley and belt (not shown) to rotate the hollow drum 5 and the suction line 16 started in operation and also the belts 21, 22 and 23 carrying freshly printed papers 30 from the press under the container 8. The operation of the apparatus shakes the container 8 suspended on flexible hangers 13 so that vibration in the container 8 constantly shakes the powder in 8 down the inclined bottom 9 into the perforated bottom 12 of 11 and the powder is evenly and constantly thereby sprinkled upon the freshly printed paper 30 as it rolls from the press.

As paper 30 passes under the head 18 all excess powder which has not adhered to the wet ink printing on paper 30 is drawn up the suction line 17a and 17 into the centrifugal separator 14 where it is fully circulated and the line dirt or dust is drawn off through suction line 16 to a waste bag and the remaining powder collected at the bottom of the separator 14 over the opening 14a. A portion of this powder drops into drum 5 on each revolution of said drum 5 through opening 7 in said drum 5 and as the said opening 7 rotates to the lower position on each revolution a definite amount of powder is dropped into holder 8.

The powder in holder 8 is under a constant shaking through the vibration of the entire apparatus while in operation and the suspension of container 8 on flexible straps 13 facilitates this shaking and the powder constantly feeds down inclined bottom 9 of container 8 through opening 10 onto perforated bottom 12 and thence onto the freshly printed portion of paper 30 to which the necessary portion of powder adheres. The excess is then drawn off through head 18 through suction lines 17a and 17 into the separator 14. This cycle of operations is continuous while the apparatus is in operation.

What I claim is:

I11 apparatus of the type described, a powder feeding means comprising a casing frame having a block rigidly mounted in the upper end of said frame, a centrifugal powder separator rigidly mounted on said frame and block, an opening in the lower end of said separator in alignment with an opening through said frame and block, a cylindrical drum rotatably mounted in said frame and block having a single side opening in complete alignment with said block, frame and separator openings in its top rotating position, a powder container suspended on flexible straps from said frame immediately below said cylindrical drum, said container having an inclined bottom terminating in an adjustable opening leading into a foraminous bottom section, a suction line connected to one side of said separator and a second suction line connected to the top of said separator and terminating at the lower end in a head adjacent to said powder container, conveyor means immediately below said powder container and suction head adapted to carry freshly printed paper from a press under said powder container and said suction head and power means for operating said drum, suction lines and conveyor means.

References Cited in the file of this patent UNITED STATES PATENTS 852,603 Hanlon May ,7, 1907 1,732,641 Coon Oct. 22, 1929 1,784,459 Lipsins Dec. 9, 1930 2,112,759 Boyer Mar. 29, 1938 2,339,908 Brewer Jan. 25, 1944 

